CN101260845A

CN101260845A - One-valve multiple-door large flow single-stage pressure reducing regulator

Info

Publication number: CN101260845A
Application number: CNA2007100880406A
Authority: CN
Inventors: 蒙国宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-11
Filing date: 2007-03-11
Publication date: 2008-09-10

Abstract

The invention provides a pressure reducing regulator used for a gas engine with the range of normal operating gas input pressure above 0 to 1MPa, which is particularly applicable to gas sources outputted by low-pressure pipeline natural gas (lower than 3KPa), associated gas in an oil field, biogas, gas and other ultra-low pressure because of great fluctuation.

Description

One one-valve multiple-door large flow single-stage pressure reducing regulator

Technical field

The invention belongs to the gas engine field.

Background technique

The existing pressure reducing regulator that is used for gas engine, during work, gas pressure produces active force to control valve sheet or spool, this active force and combustion gas incoming pressure, valve area are proportional, the constant performance of step-down of the big more reduction valve of active force is just poor more, for the constant performance of the decompression that improves pressure reducing regulator, under the prerequisite that the highest incoming pressure of combustion gas is determined, only reduce the valve area and adopt the multi-step pressure reduction structure reduce gaseous-pressure to reduction valve to the constant Effect on Performance of step-down; Reducing of pressure loading valve area and increasing of the progression that reduces pressure cause the underfed of pressure reducing regulator combustion gas incoming pressure low side, adaptive capacity that pressure reducing regulator combustion gas incoming pressure is high-end and the mutual contradiction of the output flow of low side naturally; As seen, the valve area is subjected to the high-end restriction of combustion gas incoming pressure, low pressure flow is subjected to the restriction of valve area again, and prior art can't satisfy desirable high pressure adaptive capacity and desirable low pressure output flow requirement simultaneously, and this technical problem hinders gas engine at low pressure pipeline natural gas (3KP always _aBelow), the application in super-low voltage source of the gas field such as associated gas, biogas, gas.

Summary of the invention

The objective of the invention is: the technical problem that solves high-end adaptive capacity of pressure reducing regulator incoming pressure and the mutual contradiction of low side output flow, guarantee that pressure reducing regulator is under the prerequisite that satisfies the highest original combustion gas incoming pressure adaptive capacity, satisfy the requirement of source of the gas incoming pressure low side output flow simultaneously, make the minimum proper functioning combustion gas incoming pressure of gas engine reduce the arrival atmospheric pressure.

The present invention realizes its purpose in the following manner; Form by pressure reducing regulator body, reducing valve body, relief pressure valve cartridge, diaphragm, large size symmetric type annular regulating valve (following abbreviation regulating valve), throttle down; Combustion gas inlet opening, combustion gas delivery outlet, atmosphere connection port are arranged on the pressure reducing regulator body; The combustion gas inlet opening is connected with fuel gas transportation pipeline; The combustion gas delivery outlet is connected with the combustion gas metering-orifice of mixer; Atmosphere connection port is communicated with atmosphere; The pressure reducing regulator body has inner chamber, and inner chamber is installed diaphragm, reducing valve body; Diaphragm is separated into atmospheric pressure chamber and combustion gas delivery pressure chamber to the pressure reducing regulator inner chamber; There is atmosphere connection port the atmospheric pressure chamber, and this connecting port makes the atmospheric pressure chamber be communicated with atmosphere; There is the combustion gas delivery outlet combustion gas delivery pressure chamber, and this delivery outlet makes combustion gas delivery pressure chamber be communicated with mixer combustion gas metering-orifice; The circular body of the similar cylinder shell-like of reducing valve body, be installed in the pressure reducing regulator body between combustion gas inlet opening and the combustion gas delivery pressure chamber, the symmetric type regulating valve is arranged on the reducing valve body, this valve ring shape and structure, bilateral symmetry, the combustion gas of valve can be equal to or greater than the combustion gas of combustion gas input, delivery outlet by area by area, be communicated with the combustion gas inlet opening, and corresponding cooperation with the spool bottom sides forms the blast tube by variable area; Spool is arranged in the reducing valve body, the cylindrical body of the similar piston-like of spool, spool is connected with diaphragm by connecting rod, accepts the active force of diaphragm and do corresponding to-and-fro motion in valve body; The corresponding cooperation with the regulating valve on the valve body of spool bottom sides forms the blast tube of variable area; The spool bottom surface is corresponding with the pressure reducing regulator body, cooperates to form throttle down.

Compared with the prior art, the present invention is when adapting to high fuel gas source incoming pressure, also can satisfy the requirement of the former pressure low side of combustion gas output flow, thoroughly solve the contradiction of prior art high pressure adaptive capacity and low pressure output flow, directly use the necessary condition of fuel gas source creation that super-low voltages such as low pressure pipeline rock gas (3KPa is following), associated gas, biogas, gas fluctuate widely and export for popular gas engine.

Description of drawings

Accompanying drawing 1 is the present invention the 1st embodiment's a cross-sectional view.

Accompanying drawing 2 is cross-sectional view of the present invention the 2nd embodiment.

Embodiment:

See accompanying drawing 1, present embodiment is made up of pressure reducing regulator body 1, reducing valve body 6, spool 7, diaphragm 14; Combustion gas inlet opening 2, combustion gas delivery outlet 15, atmosphere connection port 3 are arranged on the pressure reducing regulator body 1; Combustion gas inlet opening 2 is connected with fuel gas transportation pipeline; Combustion gas delivery outlet 15 is connected with the combustion gas metering-orifice of mixer; Atmosphere connection port 3 is communicated with atmosphere; Reducing valve body 6 is installed in the pressure reducing regulator body 1 between combustion gas inlet opening 2 and the combustion gas delivery pressure chamber 16; The circular body of reducing valve body 6 similar cylinder shell-likes; Regulating valve 4 is arranged on the reducing valve body 6, and regulating valve 4 is annular shape structure, bilateral symmetry, and the gross area of regulating valve 4 can be greater than the area of combustion gas inlet opening 2, delivery outlet 15, and regulating valve 4 is communicated with combustion gas inlet opening 2 by annular fuel gas chamber 5; Passage is regulated in the combustion gas that regulating valve 4 is corresponding with spool 7 bottom sides, cooperation forms variable area; Spool 7 is arranged, the cylindrical body of spool 7 similar piston-like in the reducing valve body 6; Spool 7 is connected with diaphragm 14 by connecting rod 9, accepts the active force of diaphragm 14 and do corresponding to-and-fro motion in reducing valve body 6; Passage is regulated in the combustion gas that spool 7 bottom sides are corresponding with regulating valve 4 sides, cooperation forms variable area; Spool 7 bottom surfaces form throttle down 11 with the pressure reducing regulator body over against should, cooperating; Spool upward pressure chamber 10 is communicated with by communication passage 8 with downforce chamber 12; Diaphragm 14 is arranged in the pressure reducing regulator body 1, and diaphragm 14 is separated into atmospheric pressure chamber 17, combustion gas delivery pressure chamber 16 to the inner chamber of pressure reducing regulator body 1; Atmospheric pressure chamber 17 is communicated with atmosphere by atmosphere connection port 3, and combustion gas delivery pressure chamber 16 is connected with mixer combustion gas metering-orifice by combustion gas delivery outlet 15.

When static, spool 7 makes regulating valve 4, throttle down 11 be in closed condition under the effect of gravity.

During the combustion gas input, the gap of gas pressure between regulating valve 4, reducing valve body 6 and spool 7 raises upward pressure chamber 10, communication passage 8, downforce chamber 12 pressure, this pressure makes spool 7 produce downward active force, this active force makes the bottom surface of spool 7 compress gasket seal 13 more, it is tighter that throttle down is closed, and it is better to close performance.

During engine start, engine charge degree of vacuum is by mixer combustion gas metering-orifice, combustion gas delivery outlet 15 makes combustion gas delivery pressure chamber 16 produce negative pressure, this negative pressure makes combustion gas delivery pressure chamber 16 and produces pressure difference between the pressure chamber 17 energetically, this pressure official post diaphragm 14 produces the active force that moves upward, this active force opens spool 7 throttle down 11 that moves upward by connecting rod 9, downforce chamber 12 pressure descend, make the pressure of upward pressure chamber 10 be reduced to pressure balance with spool 7 bottom surfaces by communication passage 8, spool 7 loses closing function power and is in free state, because regulating valve 4 bilateral symmetry, the gas pressure of left and right sides valve is cancelled each other to the active force that spool produces, at this moment, no matter how high the combustion gas incoming pressure have, the regulating valve area has much, gas pressure can not produce active force on spool 7, thoroughly eliminate the influence of combustion gas incoming pressure to the reduction valve control performance; Because regulating valve of the present invention is a loop configuration, the valve area can reach the area of combustion gas delivery outlet 15, when the combustion gas incoming pressure equals barometric pressure, and the spool 7 arrival upper dead center that moves upward, annular regulating valve 4 is all opened, guaranteed that the combustion gas output flow satisfies engine demand.

Because spool of the present invention is bigger, when the combustion gas incoming pressure is higher, gas pressure is very big to the closing function power of spool 7, in state of starting operating, engine speed is lower, and air consumption is less, and venturi mixer and proportion expression mixer can't provide enough negative pressure to make diaphragm 14 produce enough upwards active forces throttle down 11 is opened, so present embodiment is not suitable for and venturi mixer, the direct supporting use of proportion expression mixer; (patent application is: 2005100546327) can satisfy the starting conditions requirement of present embodiment, because this mixer also can produce the negative pressure that provides enough when engine start operating mode air consumption is very little throttle down 11 be opened " vacuum contant pressure mixer ".Make the present embodiment can proper functioning; But, when if the combustion gas incoming pressure surpasses certain value (for example 100KPa), the vacuum contant pressure mixer also can't be opened the throttle down 11 of present embodiment, so, the maximum combustion gas incoming pressure that the supporting validity constant voltage of present embodiment mixer allows should be not more than 100KPa, and the combustion gas incoming pressure scope of proper functioning is 0～100KPa.

The 1st embodiment is if supporting venturi mixer, proportion expression mixer, must increase an air-break switch, in state of starting operating the pressure releasing of pressure chamber 10 is fallen, make spool 7 be in free state, the negative pressure that venturi mixer and proportion expression mixer produce in state of starting operating could be opened throttle down 11 and enter normal working; Help to open throttle down 11 if increase compression relief cock, the maximum combustion gas incoming pressure of present embodiment just can increase substantially, and the normal operating pressure scope just can reach more than 0～1MPa.

In the problem of opening of state of starting operating throttle down, the 2nd embodiment is provided with a pressure relief valve on spool when solving the high combustion gas incoming pressure of the present invention.

Accompanying drawing 2 is cross-sectional view of the present invention the 2nd embodiment, sees accompanying drawing 2, and the main distinction is to have increased a pressure relief valve 9, and spool 10 is to be dynamically connected with connecting rod 11; One end of connecting rod 11 is fixedlyed connected with diaphragm 2, and another is installed pressure relief valve sheet and is dynamically connected with spool 10, and the active force that connecting rod 11 is accepted diaphragm 2 is done to-and-fro motion by a small margin in spool 10, control the open and close of pressure relief valve 9; Pressure relief valve 9 is communicated with combustion gas delivery pressure chamber 4 through communication passage 7.

When static, pressure relief valve 9, regulating valve 6, throttle down 14 all are in closed condition under the action of gravity of connecting rod 11, spool 10.

During the gas pressure input, gas pressure makes pressure chamber 8 produce pressure by the gap between regulating valve 6, valve body 12 and the spool 10, this pressure acts on the spool 10, make spool 10 produce the active force of closing downwards, this closing function power makes the sealing surface of the switch valve 14 of spool bottom surface compress seal rubber pad 15 more, make throttle down 14 to close performance better.

During engine start, mixer is sent very little negative pressure here makes diaphragm 2 produce very little upwards active force, because the area of pressure relief valve 9 is very little, diaphragm 2 produces very little active force and just can open pressure relief valve 9, the pressure of pressure chamber 8 is released by communication passage 7, make spool 10 be in free state, guarantee that the input of very little negative pressure just can normally open throttle down 14 and enter normal working; Therefore, present embodiment can with venturi mixer, the supporting use of proportion expression mixer, if with the supporting use of vacuum contant pressure mixer, proper functioning combustion gas incoming pressure scope of the present invention just can reach more than 0～1MPa.

Claims

A kind of pressure reducing regulator that is used for gas engine is characterized in that: be made up of pressure reducing regulator body, reducing valve body, relief pressure valve cartridge, diaphragm, large size symmetry annular regulating valve (following abbreviation regulating valve), throttle down; Combustion gas inlet opening, combustion gas delivery outlet and atmosphere connection port are arranged on the pressure reducing regulator body; The combustion gas inlet opening is connected with fuel gas transportation pipeline, the combustion gas delivery outlet is connected with the combustion gas metering-orifice of mixer, atmosphere connection port is communicated with atmosphere; The pressure reducing regulator body has inner chamber, and inner chamber is installed diaphragm, reduction valve; Diaphragm is separated into atmospheric pressure chamber and combustion gas delivery pressure chamber to the pressure reducing regulator intracoelomic cavity; There is atmosphere connection port the atmospheric pressure chamber, and this connecting port makes the atmospheric pressure chamber be communicated with atmosphere; There is the combustion gas delivery outlet combustion gas delivery pressure chamber, and this delivery outlet makes combustion gas delivery pressure chamber be connected with mixer combustion gas metering-orifice; The circular body of the similar cylinder shell-like of reducing valve body, be installed in the pressure reducing regulator body between combustion gas inlet opening and the combustion gas delivery pressure chamber, the symmetric type regulating valve is arranged on the reducing valve body, this valve loop configuration, bilateral symmetry, the combustion gas of valve can be equal to or greater than the combustion gas of combustion gas inlet opening, combustion gas delivery outlet by area by area, be communicated with the combustion gas inlet opening, with the blast tube of spool bottom sides corresponding matching formation variable area; Spool is arranged in the reducing valve body, the cylindrical body of the similar piston-like of spool, spool is connected with diaphragm by connecting rod, accepts the active force of diaphragm and do corresponding to-and-fro motion in valve body; The blast tube that the spool bottom sides is corresponding with the regulating valve on the valve body, cooperation forms variable area; The spool bottom surface is corresponding with the pressure reducing regulator body, cooperates to form throttle down.